Synthesis 2022; 54(12): 2885-2893
DOI: 10.1055/a-1777-2423
paper

Stereoselective Synthesis of Dispirooxindoles Incorporating Pyrrolo[2,1-a]isoquinoline via [3+2] Cycloaddition of Azomethine Ylides with a Thiazolo[3,2-a]indole Dipolarophile

Noble V. Thomas
,
C. B. Meenakshy
,
Sruthi S. Leena
,
Ani Deepthi
N.V.T thanks the University Grants Commission (UGC) for the financial support in terms of Senior research fellowship and M.C.B and S.S.L thank University of Kerala for Junior research fellowships.


Abstract

Highly regio- and stereoselective synthesis of dispiropyrrolo[2,1-a]isoquinoline-oxindoles have been developed by the one-pot three component reaction of isatins, 1,2,3,4-tetrahydroisoquinoline (THIQ), and a thiazolo[3,2-a]indole derivative. The reaction proceeds regioselectively through an exo-Re face approach of the in situ generated tetrahydroisoquinolium ylides towards the dipolarophile yielding the corresponding [3+2] cycloadducts in excellent yields and stereoselectivity.

Supporting Information



Publication History

Received: 18 February 2022

Accepted after revision: 21 February 2022

Accepted Manuscript online:
21 February 2022

Article published online:
05 April 2022

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